a couple of guys on here say that there windows have some sort of "film" that help repels the water. Who knows. All i know is the one that the rig that i got, came on it. Apparently someone else had ordered the truck and backed out at the last minute.
So i was stuck with it. Personally, i wouldn' have gotten it on the windows but the other guy did. then the dealership told me that i had to pay for it, so i told them to go ef themselvs. Well, not really, i just told them to take out the windows that it had it on, and replace them with the windows that didn't have it on there, then i would take the truck. I wasn't going to pay ,however much more for that option, but they gave it to me for "free". Don't get me wrong, it def. works, i just don't know if it was worth the x-tra money.